Based on your description, it sounds like what you found is likely a vintage or antique glass insulator, a lamp part, or possibly a decorative finial, rather than a random “mushroom.” Let’s break it down:
🔍 Key Clues from Your Description
- Glass mushroom shape → Many antique items, especially electrical or decorative, were made with glass domes or “cap” shapes.
- Velvet-lined box → Suggests it was a collectible or a delicate part, not just junk.
- Metal connector at the bottom → Usually indicates it screws or attaches to something:
- Electrical fitting
- Lamp or light fixture
- Scientific or laboratory equipment
🛠️ Likely Possibilities
- Vintage Lamp Part / Finial
- Mushroom-shaped glass tops were commonly used as decorative lamp finials or lamp globes.
- The metal connector could screw onto a lamp harp or fixture.
- Glass Electrical Insulator
- Some old electrical equipment used glass mushroom-shaped insulators to cover or protect wiring.
- These were often mounted with a metal base.
- Scientific / Lab Equipment
- Rare, but mushroom-shaped glass with a metal base could be part of an old vacuum apparatus, pressure gauge, or chemistry lab instrument.
- Collectible Figurine / Decorative Object
- Some estate sale collectibles were made of glass with metal mounts (e.g., paperweights, art deco decorations).
📝 Tips to Identify It More Precisely
- Check for maker marks, numbers, or stamps on the metal or glass.
- See if the metal connector screws or fits into anything nearby — lamps, mounts, or electrical fittings.
- Compare with images online: search for “vintage glass mushroom lamp finial” or “glass electrical insulator mushroom.”
- If it’s a rare collectible, a local antique dealer or estate appraiser may give more insight.
If you want, you can send a photo of it (especially showing the metal connector and underside). I can help pinpoint exactly what it is and what it was used for.
Do you want to do that?